Zobrazeno 1 - 10
of 137
pro vyhledávání: '"Wills, Beverley"'
Autor:
Matthews, Brandon M., Shemmer, Ohad, Dix, Cooper, Brotherton, Michael S., Myers, Adam D., Andruchow, I., Brandt, W. N., Ferrero, Gabriel A., Gallagher, S. C., Green, Richard, Lira, Paulina, Plotkin, Richard M., Richards, Gordon T., Runnoe, Jessie C., Schneider, Donald P., Shen, Yue, Strauss, Michael A., Wills, Beverley J.
We present spectroscopic measurements for 226 sources from the Gemini Near Infrared Spectrograph - Distant Quasar Survey (GNIRS-DQS). Being the largest uniform, homogeneous survey of its kind, it represents a flux-limited sample ($m_{i}$ ${\lesssim}$
Externí odkaz:
http://arxiv.org/abs/2011.10895
Autor:
Maithil, Jaya, Runnoe, Jessie C., Brotherton, Michael S., Wardle, John F., Wills, Beverley J., DiPompeo, Michael, De Breuck, Carlos
Radio core dominance measurements, an indicator of jet orientation, sometimes rely on core flux density measurements from large-area surveys like Faint Images of the Radio Sky at Twenty cm (FIRST) that have an angular resolution of only 5''. Such low
Externí odkaz:
http://arxiv.org/abs/2010.08668
Black hole masses are estimated for radio-loud quasars using several self-consistent scaling relationships based on emission-line widths and continuum luminosities. The emission lines used, H-beta, Mg II, and C IV, have different dependencies on orie
Externí odkaz:
http://arxiv.org/abs/1211.3984
Autor:
Shang, Zhaohui, Brotherton, Michael, Wills, Beverley J, Wills, Derek, Cales, Sabrina, Dale, Daniel A, Green, Richard F., Runnoe, Jessie, Nemmen, Rodrigo S., Gallagher, Sarah, Ganguly, Rajib, Hines, Dean C., Kelly, Benjamin, Kriss, Gerard A., Li, Jun, Tang, Baitian, Xie, Yanxia
Publikováno v:
2011 ApJS..196....2
We have produced the next generation of quasar spectral energy distributions (SEDs), essentially updating the work of Elvis et al. (1994) by using high-quality data obtained with several space and ground-based telescopes, including NASA's Great Obser
Externí odkaz:
http://arxiv.org/abs/1107.1855
Publikováno v:
Astrophys.J.706:995-1007,2009
We present the results of a spectral principal component analysis on 9046 broad-line AGN from the Sloan Digital Sky Survey. We examine correlations between spectral regions within various eigenspectra (e.g., between Fe II strength and H$\beta$ width)
Externí odkaz:
http://arxiv.org/abs/0911.2314
Publikováno v:
Astron.J.134:294-313,2007
We have obtained quasi-simultaneous ultraviolet-optical spectra for 22 out of 23 quasars in the complete PG-X-ray sample with redshift, z<0.4, and M_B<-23. The spectra cover rest-frame wavelengths from at least Lyman-alpha to H-alpha. Here we provide
Externí odkaz:
http://arxiv.org/abs/astro-ph/0703690
Autor:
Miller, B. P., Brandt, W. N., Gallagher, S. C., Laor, A., Wills, Beverley J., Garmire, G. P., Schneider, D. P.
Publikováno v:
Astrophys.J.652:163-176,2006
We investigate the X-ray properties of PG 1004+130, a low-redshift radio-loud broad absorption line (BAL) quasar with a hybrid FR I/FR II radio morphology. The 22.2 ks XMM-Newton and 41.6 ks Chandra observations presented here are the first X-ray det
Externí odkaz:
http://arxiv.org/abs/astro-ph/0607031
Publikováno v:
Astrophys.J. 646 (2006) 76-84
We present far-ultraviolet spectra of the Seyfert2 galaxy Mrk533 obtained with FUSE. These spectra show narrow asymmetrical OVI 1032,1038 emission lines with stronger wings shortward of the peak wavelength, but the degree of asymmetry of these wings
Externí odkaz:
http://arxiv.org/abs/astro-ph/0603842
Autor:
Shang, Zhaohui, Wills, Beverley J.
We discuss spectral principal component analysis (SPCA) and show examples of its application in analyzing AGN spectra in both small and large samples. It can be used to identify peculiar spectra and classify AGN spectra. Its application to correlatio
Externí odkaz:
http://arxiv.org/abs/astro-ph/0403615
Publikováno v:
Astrophys.J. 603 (2004) 425-435
With a 1999 ASCA observation, PG2112+059 became notable as the first Broad Absorption Line (BAL) quasar found to exhibit a typical radio-quiet quasar X-ray continuum underlying a large amount of intrinsic absorption. We present a recent Chandra ACIS-
Externí odkaz:
http://arxiv.org/abs/astro-ph/0311401